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Related Experiment Videos

Molecular interactions in imatinib-DPPC liposomes.

Szabolcs Béni1, Marianna Budai, Béla Noszál

  • 1Semmelweis University, Department of Pharmaceutical Chemistry, Research Group for Drugs of Abuse and Doping Agents, Hungarian Academy of Sciences, H-1092 Budapest, Hogyes E. u. 9, Hungary.

European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences
|November 18, 2005
PubMed
Summary

This study explored liposomal imatinib formulations, revealing pH-dependent interactions with lipid membranes. Imatinib

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Area of Science:

  • Pharmacology
  • Materials Science
  • Biophysics

Background:

  • Imatinib (Gleevec) is a vital chemotherapeutic targeting Bcr-Abl tyrosine kinase for chronic myeloid leukemia (CML) and gastrointestinal stromal tumors (GIST).
  • Understanding drug-lipid interactions is crucial for optimizing liposomal drug delivery systems.

Purpose of the Study:

  • To design a liposomal imatinib formulation.
  • To investigate the molecular interactions between imatinib and DPPC lipids within liposomal membranes at different pH values.

Main Methods:

  • Preparation of multilamellar (MLV) and small unilamellar vesicles (SUV) using alpha-L-dipalmitoyl-phosphatidylcholine (DPPC).
  • Electron paramagnetic resonance (EPR) spectroscopy and differential scanning calorimetry (DSC) to study imatinib's effect on DPPC membranes.

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  • Dynamic light scattering and freeze-fracture electron microscopy for liposome characterization.

    • Main Results:

    • Imatinib primarily interacts with DPPC head groups, slightly increasing headgroup mobility in MLVs.
    • Imatinib significantly reduces SUV fluidity, suggesting a pH-dependent fusion/fission mechanism.
    • Liposome size and morphology were confirmed via DLS and FF-EM.

    Conclusions:

    • Imatinib exhibits distinct interactions with liposomal membranes based on vesicle size and pH.
    • The findings highlight the importance of considering pH-dependent membrane effects in liposomal imatinib formulation.
    • Further research into imatinib's interactions with artificial and biological membranes is warranted.